Generalized tangent numbers d(n,1).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =4a(5) =6a(6) =8a(7) =8a(8) =12a(9) =14a(10) =14a(11) =16a(12) =20a(13) =20a(14) =24a(15) =32a(16) =24a(17) =30a(18) =38a(19) =32a(20) =40a(21) =46a(22) =40a(23) =48a(24) =60a(25) =50a(26) =54a(27) =64a(28) =60a(29) =68